OR shirts fit differently than their outerwear; for a long time I bought my shirts in Med because that's what I wear in their coats and jackets. I finally clued in and purchased a few in large. This is not totally consistent across styles, and this shirt did not fit. It was large and bulky. I am 5' 10 ½" and 157 lbs, smaller bust, athletic build. The medium may have fit really nicely, but I didn't love the style enough to repurchase.